My opinion is it is better to study your games rather than master games. Or anyone else's for that matter. I have it all spelled out in my free video lessons course, linked here on my profile. My group has many support systems in place, that's also linked on my profile. I do have a series on my own games, where I will show, game by game how I developed from a 1400 to a 2200 player. Two of those videos are public and linked in my video lessons fgroup forum.

One piece of advice that will probably do more to raise your rating than any course of study: dump the bullet.

+1

Blitz, too. In fact, at lower levels even Rapid (g/25) isn't a help.

Chess is a game of thought and planning. It takes time to learn and to play well. The only reason time limits of any sort were introduced was because some lesser players took advantage and used hours on single moves, hoping to win through attrition.

Fast time controls are fun variants, but they are fun because they are the exact opposite of what the game essentially is, they allow no time to reflect. As mindless entertainment it beats teasing the cat, but is no more likely to improve your understanding of chess.